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1) Petrobras Website, 2008
2) Vale Website, 2008
3) Royal Dutch Shell plc Website, 2008
4) Domestic Fuel.com, 2008
5) ExxonMobil Website, 2008
6) Occidental Petroleum Website, 2008
7) BP plc Website, 2008 |
8) Total Website, 2008
9) Petrominerales Website, 2008
10) Gran Tierra Energy Website, 2008
11) BG Group Website, 2008
12) ENI S.p.A. Website, 2008
13) Devon Energy Website, 2008 |